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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44576f90eb3c24943c42e71ed89cb215b31cd3d3071dbb46d827f29fd09b58d7' 
  AND token = 'cGx7857R1ngeYeDH3cm1xB45Egj7p1xfhPBR1/GJe8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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