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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c787a2e0c5171e296d7feacd13968bd2fe9ee5b6273f68ab3e7a2fed3f012e3' 
  AND token = 'vC/RObBPzDo2CvmvlI2yfTncTHBMdZW76H7b1lJMghE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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