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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9d1e5d4d3dd59379b3209657df85752d9511b21839eef6fa231545c03ae0a2' 
  AND token = '70Jii71xrUqJIhZm8vF0UTYMENBSr2lKNDsFD8WHdSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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