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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b20ace511f6caa07b46e12aa22b458c0fd30e6389f79602f5fd2328d4c41d7' 
  AND token = 'w24kktT7M3WPpwYh7yV18FKorEPElx7g03kOggCKNrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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