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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c22bef91b4318c22215b59dadc3f59871d481297e455e1e046c7c4bde7d2f96' 
  AND token = 'I4ABeZ1vtBM2b0cAnhVVivHxYMw9Zc2gxVqtQ+mEpsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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