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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ded1be7c8898a37995d189316d4165de5abf294e3f4da6d42e739acd9b4970' 
  AND token = '7mg39d64jI9n8u4vCpb9PeZ0ifOSCAvW6RIeJiXX6No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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