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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab260679ab525f013756ee0d33f3ad69387cde0dcacde2fe1032b517bbee64a6' 
  AND token = 'RsO8cb1c96BbYtsZ39k7ettjYMSVcJ0vubW+21JCm1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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