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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c90c9721a54202a8b0cdeda51c53daa5de6de463bb246cae7faad2bd8f00b4' 
  AND token = '5mtTHEw7hP5j2E49uTfU/FGikMRDJoUyxCzXUBGYqfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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