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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69fc3acab791b802428ae07bdcd6c45e155ae4d0d335cd2060e1813f6249be3' 
  AND token = 'EJ++a/VwYRno9RhRZTih6pViVLbxx7pJ+zTocT+df/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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