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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0a494fab8351ddfac80efba4c74673fc2c113bdd4bef300ee39e5cc72d9dd0' 
  AND token = '8dH9ZEHyUrfSywoqo09UULnrmDy+B/+TRkEzXvmSl6s=' 
  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"
    }
  }
}