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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05752899f0b8a47acfca8a6a0e8b7c68db769140a7e88b111d9f12572d2b945b' 
  AND token = '/9jP7umwra3Ebn5ClLBvCPpaSy42Fqypcn+L9Qt0v54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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