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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7923704a47fb2c7acd6c43563128a0e059bd172c6ad76b25cc8357dc2d80a7' 
  AND token = 's7UxueMZNCvTkX/pS0dpAVRLVcpK6Ab7vnUfUuJF69k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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