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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae931ef3cbe2f0972b50c49a2a75a7fa1daf0efe54decdf14042697e61472a22' 
  AND token = 'xRg9Jc9GAenCvrjadKUFa+5XCX2bdTMY6VG+/47wus0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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