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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e83f647d2f7aad98d9e81dcc68d2646cc0bebeccafe0c425c4ebcc815a2e711' 
  AND token = 'UbS96e8vkxayuOU5Rn/QbNUlQCENN2Yg+Md2l13Xi6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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