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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef41b261b8e8e7699121d937c8a9fe179512104c79ee8942c959b535d9cdfa66' 
  AND token = 'TcsmA7uFP/X7Kj7VdkjmaeVrVJaC4JmCgkNe6x+dq+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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