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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3607765e59366809dbfa4d5349e2fe5165baa4486b04e24dae104078b6a077d' 
  AND token = '5O9Ci1QHUY0sxHGGf7s8RUHAtXmi0cpRl1pB+LD98NM=' 
  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"
    }
  }
}