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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad9642f540a44d8154147c4aba7a2d2eeac4ec98a5cc040594fd9f996e3724e' 
  AND token = 'w2lDNtv486zn7JV70pY85MM05gsnzKbdMBwySAIAmBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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