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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8c64b14cc07cc84e741fa010f5f57e7509913b03d1f31f1f0115d629b264c3' 
  AND token = 'SRiisKsUNYmauBmrR7aRMJIesFl0wsnJ7YitKUhZ6os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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