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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562f163166a74f6cc6b5944967a98a825fac0b8a51af8857ed371010bd4b5454' 
  AND token = '8glss3LY3qApKbp80Jp7SBn96uhfbAJljnBPC5R0U+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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