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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506cc2aa68ae85b07eea5e13c3ad7c5a59de34f5b04edc6ba5518d3c24edb4d4' 
  AND token = '9HOg+323eJsfQ75FyGEqrFX0EyuqXrIT2x9BTRI8EHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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