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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1d8018ade8a0b92b059c9d06adbb2dc34a56bf38b5df6f8d38fc4b0569b282' 
  AND token = 'BUp7I8TWGHuA9WdNMnqP3v7wt+ORNAOQi0dnNC33Kw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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