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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a08bd80646fde9e8920e58c6d34fee112fc54cc110a9d8cf232b9a2e843e430' 
  AND token = 'AQvTMHsEZ46F2UVbefW3z8VNHWoAf7gUcv1VwdJWFXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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