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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e9786f84d06cd7800ee0d100a326371daba2c4e574a13467c1d42157200dc8' 
  AND token = 'tZZ5iAQDsot0XDXil9j031FqHD4+5Lov/Dp0fqvPKic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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