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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76da828f24289e9badab151f5875982c82efa20039c2df42d0fa5bae75a0a829' 
  AND token = 'wHmaRqPzZ/WfUokwOy+7HE6SkQLIq1yoj5D7pRw1aC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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