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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8b7e9f0e50a60eb64fa502c4e69a39b3e6fc9362bd977e927ad8aa275b37a4' 
  AND token = 'Z6HMxfS1TPKyq+5T1Nb0Z98fJI8AJuhsMXjWtodgcRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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