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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c55d0b12584b274631a653485e782b0f02a53aae5b13f95c1b914cd3ffe357' 
  AND token = 'WDbXzBs7p9TooXzOo+E7nC1ZpYz7B9HQnkRJa9GLB3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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