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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c17644adf20d90b034d7d5d6a49fd97e6d27f94df137d0545670f57f5e4d06' 
  AND token = '7WD5sopzEUZ+5CkqRxKZ5ZXF5S8Qu81255gG77mPbLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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