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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cacf4f4acd8029a9155e2493acc851599cf604a7a815816d5010dcbefb840a19' 
  AND token = 'BMgssI8UJ5CGcbdaP1WRZLkhX2cZHZwjk33XpCdX2gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}