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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab1e42958e6055e595762c90f5b1fcfe3c84ed3c932dcace0c2105c20fae33f' 
  AND token = '0DKl89vvy66RlbBQlYQyAa8dl10LCS20AH/jXZn8nIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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