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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4238b92d11b9fda070c86c2061e2e9cf341a284479654373a0ae289f8b689886' 
  AND token = 'HwpCTCgihyCFTb5e2gblLzmC6+Chda6fkT0G/p2QWp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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