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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641e917930c5fe223d09fca394dac34c1f01a03f45d5c15e3cb3baffbe616b12' 
  AND token = '34vv4SPRNPo1LqrQXPz3i6tLQkLGIPzw7G5NDDgH9yo=' 
  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"
    }
  }
}