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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0b4a458d880d10ebe1122919a697c0c30a12e1952d0b9975490407067afe3c' 
  AND token = 'MHF11yLSHGp23nM0dinEmsCsZj0vsNjfedFAJQHCBL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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