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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc189d6a3e79f723e23551430ded415d95f1c09e607a8c7b37c8f2482c380e5e' 
  AND token = '7c+3OtfwlWdVyQye4xVMdnOx+2qJxi3L9Hzdy91739I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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