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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c312c0a84a4ece272fdbb2dd826a9ee166ee9c5ecb2095a07b42f2c859d6b60' 
  AND token = '6hdc8LGeEVQ6XGIGmNncgmVUcz4fQlgZ9TtrcTNytC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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