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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809ef38f1a00f0a6f87f68a1e7a9b200571db6c7fc4458f95e22a5dc4cf23d46' 
  AND token = '19mXbRMRCHilrhfG+XT414xs4XpPM+1AwFv6VaHUzG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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