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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5e0bcb1405944b85b1e44a68ca5b1034642deea99166f4a09e5b40e4f035fa' 
  AND token = 'MQSRZycO9FklUFR4SC3p4m7yZAnwV0z2uIFIo8xa1XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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