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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2662d7ff97d43cc4d7bd2df0ba18673665d9f583ace5b8318b805e5b8dbf36' 
  AND token = '1Gaqpsffewxk9s4dlkuCNjXoOhJmU4uqdqHrKuDaKto=' 
  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"
    }
  }
}