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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be551cb2cd8fa97feda6b3fa23aa73b6183aa6acea2d518c478767f4fa5ed8d5' 
  AND token = 'TsvLmSCpfS5SYC0jkar++SPVnL+1NdjArVMCgiEJSZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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