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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c154f5bdc47bca7ea04a4a5024d87b5c714bf8a47037dc35c333f0241dfddba3' 
  AND token = '5aS0cDLqC3O2CoAaYpkXcet4L8E1TLoPxfithuo9SCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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