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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '521675b262b4c4cd923059f0139819cfa634645333dc1bd38c23a7c188674b60' 
  AND token = 'YzItiy6YgPcYX1R59G2Lziy4hFSONKnp2gtyQ0l4pOY=' 
  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"
    }
  }
}