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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64112fc361365e1eeb6e4c18ce4f897a88283b7e7a1d86bf0d9b078f91af7553' 
  AND token = 'ihqj59tuCBIFRMcw1pZEFBNCDQaxaOALdE1R6mQatU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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