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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d220f67563b4e02fc670226a958fdef6a30bcc312d2099d43a6b93148d3f4c5' 
  AND token = 'XTAas2uXwamZo+58Wii1jAkDoxoHY3p3BWpT8uodjrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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