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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0075cf3306b54f4314945cdb1fb579232a94eb97394c69f3e0c1720b1461c32c' 
  AND token = 'B7XDVW2mN/L+4MSOMSBESvSUBRfZbmSiGVquKJFqC2E=' 
  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"
    }
  }
}