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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e94106231f83b435826af3c9dc30cde719a0f8a0a7884b74db678a1cb7cea03' 
  AND token = 'kMMQ65xO0mx+b+2+ljtZxd/RC2I9Ni2bWJWCLqNoaYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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