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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25dd1ed7f9d7616b54a5667e83dd9600682c6d7fdb2e21caee3698143fec2288' 
  AND token = '98fgnP+RHw0r9gP6HKyXOKKLis7KBB+tDYAVAm2Q/iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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