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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26781e1e40a597b640abd35de8cbe9bc64a45eba805ab44ada6aa5ff6d169c5' 
  AND token = 'MgZfTF8ZeNEom9jwoS94DhhE2wEHUr+8vd5ehzTviyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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