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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013599467f1dc311af622e6cdab3580642672d482f0c34144b16d7d8cb62d86a' 
  AND token = '8VGbk6L3B+xeTw3RCtydj63dlSeVtXNRGxhBAPUPISo=' 
  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"
    }
  }
}