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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58127298c15c52444135805bddfc8fc86fef9468766e5c9fcc77990f481dfc8c' 
  AND token = '2/2vvjf+9dUAlcvmk1nVZb43Y81PlEOxmkg+08hgD2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00164

JSON explain

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