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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92259c0833981c6c91c148a44ce0e0edabc725e2f1a6d14eb4adcf8e21559f9e' 
  AND token = 'Yns/zWbTHxALWAKkJYblf+m+DyCYHXbKSm9y5Ur+BLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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