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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29881393dcb58189499eea72df0de8889216143cf54ec5da8b65412cc3274de3' 
  AND token = 'UNOpEb5o+oaXZ0R1n1BZw0+nAM+s3iYAP4SjopFLTBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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