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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b1ea8090367d1ff6f03762a49844cfe6dd1d4ef0f55716fd2da3beb3e83769' 
  AND token = 'P0Mc2+iz1bwdDmYlGl/8wHO3jkL4yd47ZKuxvyeGL7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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