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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1036ab7c659dd7101a18a1674815b0031a13b159c48564af01f6ac0e92d5f4' 
  AND token = 'HYjUXryGo8WuwaVb4iPZVS93vLVf9deZSBwFzkNPw0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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