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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75865f045a91f0d5268d1692191ab3cc36f85fbe0521ef42b1da48693a853e7e' 
  AND token = 'zrfmnQ+2KsibIJ29IJjBtnC60n7jtbRxO7fupR8FJEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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