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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7606e204a4f05bc19207bfde24ae4d9e8e8f94114b63a07a74dd9d29ccfc6851' 
  AND token = 'oUXCCjp1Dn5Iu30X4apwq8YUt68+CklFUcZP6p621nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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