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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc821fb9c5bd6691b9c9a2cf35d52c88675407e5ec037d213e88384d1128c11' 
  AND token = 'JDkASK4Mzt93RKOkIIO7B/Rpmol1PBq92BH2tg6Rt0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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