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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9defe61f4f12d04fa077d7e29001a7bfd15d7ef0eb7d127923d6fa8a349d6379' 
  AND token = '1ff+6S2U1eGQLVgu+AXsDc9yZKBIoajS19iKWPbgY20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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