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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f280fce88d99622ebfc1f15872033512c2d2c24cb4a8e02110fef09e830b9d9b' 
  AND token = 'qVh7n5J/zIFf4zZ76bIbiEBAwqEZ2fF/sEtY90ku/oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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