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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc4558e4c3605339d4fa6a10832fd557c9b91c1e88ac0ce5080d3ae38aac1f6' 
  AND token = 'c6Al/k7VuCnBgPn9IJz3iQj8fUQQSm6kqpXjNVbrnac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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