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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fb9b03fe44345e339743ffe03bf72d1f1c6898fa108dc9bc050f563ed53d34' 
  AND token = 'SlD7iLbT9+fLVkxOGGcGwBz/wyx5gqoqAsbBbKDJx5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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